The Catacombs of Priscilla were excavated between the second and fifth centuries starting from three independent points revealing the main attractions: a sandstone crypt, a villa and the Acilius Gabrio family plot. Dug out of "tufo", a type of stone, the tunnels wind along almost 13 km of underground pathways, occasionally revealing small rooms, cubicles, family tombs or graves. Due to the burial of many martyrs in ancient times, the Catacombs of Priscilla were often referred to as the "Queen of the catacombs".